To compensate for length changes in pipelines expansion bends&comma; stuffing box compensators or expansion bellows are used&period; Bellows have proved particulaly suitable for lined pipe which may be subjected to shock and vibration&period; They also accomodate axial misalignment&period; Further advantages include simple space-saving design and speedy installation&period;

Typical Applications&colon; Chemical Engineering-PTFE is employed in all cases where corrosive substances are used and where conventional materials create sealing problems&period; Glass apparatus is an example&period; In this type of equipment&comma; PTFE is used for expansion bellows&comma; which are designed to compensate for mechanical and thermal changes&comma; flexible tubing&comma; seals&comma; glandless valves&comma; turbine stirrers&comma; etc&period;